How can i import blender 3d model in after effect
No, Currently You Can't (According to me)
Currently There is No Live Link Between After Effects and Blender to Directly Import 3d Model in After Effects But You can Export Tracking Data or Other Data from After Effects to Blender and Vice Versa Using Python Scripts 
or You Can Just Import a 3D Model in After Effects Using "Element 3d Plugin For After Effects" But That Needs GPU "Element 3d" Will Not Run On CPU.